Superstrings in Graviphoton Background and N=1/2+3/2 Supersymmetry

Details Superstrings in Graviphoton Background and N=1/2+3/2 Supersymmetry Superstrings in Graviphoton Background and N=1/2+3/2 Supersymmetry

2003-06-24

arxiv.org/abs/hep-th/0306226v2

JHEP 0307:010,2003

Physics

High Energy Physics

High Energy Physics - Theory

Added references and a footnote

Scientific paper

10.1088/1126-6708/2003/07/010

Motivated by Ooguri and Vafa, we study superstrings in flat R^4 in a constant self-dual graviphoton background. The supergravity equations of motion are satisfied in this background which deforms the N=2 d=4 flat space super-Poincare algebra to another algebra with eight supercharges. A D-brane in this space preserves a quarter of the supercharges; i.e. N=1/2 supersymmetry is realized linearly, and the remaining N=3/2 supersymmetry is realized nonlinearly. The theory on the brane can be described as a theory in noncommutative superspace in which the chiral fermionic coordinates $\theta^\alpha$ of N=1 d=4 superspace are not Grassman variables but satisfy a Clifford algebra.

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